M. C. Gutzwiller, Moon-Earth-Sun: The oldest three-body problem, Reviews of Modern Physics, vol.70, issue.2, p.589, 1998.
DOI : 10.1103/RevModPhys.70.589

J. Carbonell, R. Lazauskas, D. Delande, L. Hilico, and S. Kiliç, molecular ion, Europhysics Letters (EPL), vol.64, issue.3, p.316, 2003.
DOI : 10.1209/epl/i2003-00176-1

URL : https://hal.archives-ouvertes.fr/in2p3-00014071

P. G. Harris, H. C. Bryant, A. H. Mohagheghi, R. A. Reeder, H. Sharifian et al., ion, Physical Review Letters, vol.65, issue.3, p.309, 1990.
DOI : 10.1103/PhysRevLett.65.309

URL : https://hal.archives-ouvertes.fr/in2p3-00016995

U. Fano, Correlations of two excited electrons, Reports on Progress in Physics, vol.46, issue.2, p.97, 1983.
DOI : 10.1088/0034-4885/46/2/001

G. Tanner, K. Richter, and J. M. Rost, The theory of two-electron atoms: between ground state and complete fragmentation, Reviews of Modern Physics, vol.72, issue.2, p.497, 2000.
DOI : 10.1103/RevModPhys.72.497

M. Domke, K. Schulz, G. Remmers, G. Kaindl, and D. Wintgen, double-excitation states in helium, Physical Review A, vol.53, issue.3, p.1424, 1996.
DOI : 10.1103/PhysRevA.53.1424

A. Menzel, S. P. Frigo, S. B. Whitfield, and C. D. Caldwell, =5 threshold in helium, Physical Review A, vol.54, issue.3, p.2080, 1996.
DOI : 10.1103/PhysRevA.54.2080

A. Czasch, Threshold, Physical Review Letters, vol.95, issue.24, p.243003, 2005.
DOI : 10.1103/PhysRevLett.95.243003

B. Grémaud and D. Delande, Photo-ionization of the helium atom close to the double-ionization threshold: Towards the Ericson regime, Europhysics Letters (EPL), vol.40, issue.4, p.363, 1997.
DOI : 10.1209/epl/i1997-00472-2

D. Wintgen and D. Delande, states in helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.26, issue.14, p.399, 1993.
DOI : 10.1088/0953-4075/26/14/004

M. Brauner, J. S. Briggs, and H. Klar, Triply-differential cross sections for ionisation of hydrogen atoms by electrons and positrons, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.22, issue.14, p.2265, 1989.
DOI : 10.1088/0953-4075/22/14/010

F. Maulbetsch and J. S. Briggs, Angular distribution of electrons following double photoionization, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.26, issue.11, p.1679, 1993.
DOI : 10.1088/0953-4075/26/11/005

D. Proulx and R. Shakeshaft, Double ionization of helium by a single photon with energy 89???140 eV, Physical Review A, vol.48, issue.2, p.875, 1993.
DOI : 10.1103/PhysRevA.48.R875

I. Bray and A. T. Stelbovics, Explicit demonstration of the convergence of the close-coupling method for a Coulomb three-body problem, Physical Review Letters, vol.69, issue.1, p.53, 1992.
DOI : 10.1103/PhysRevLett.69.53

C. W. Mccurdy and T. N. Rescigno, Calculating differential cross sections for electron-impact ionization without explicit use of the asymptotic form, Physical Review A, vol.56, issue.6, p.4369, 1997.
DOI : 10.1103/PhysRevA.56.R4369

M. Baertschy, T. N. Rescigno, W. A. Isaacs, X. Li, C. W. Mccurdy et al., Electron-impact ionization of atomic hydrogen, Physical Review A, vol.63, issue.2, pp.22712-22709, 2001.
DOI : 10.1103/PhysRevA.63.022712

M. S. Pindzola and F. Robicheaux, Time-dependent close-coupling calculations of correlated photoionization processes in helium, Physical Review A, vol.57, issue.1, p.318, 1998.
DOI : 10.1103/PhysRevA.57.318

M. S. Pindzola, F. Robicheaux, J. Colgan, M. S. Pindzola, and F. Robicheaux, Time-dependent close-coupling calculations for the electron-impact ionization of helium, Physical Review A, vol.61, issue.5, pp.52707-457, 2000.
DOI : 10.1103/PhysRevA.61.052707

D. Seccombe, S. Collins, T. Reddish, . Selles, A. Malegat et al., with various electron energy sharing conditions, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.35, issue.17, p.3767, 2002.
DOI : 10.1088/0953-4075/35/17/312

S. A. Collins, S. Cvejanovic, C. Dawson, T. J. Reddish, D. P. Seccombe et al., Double photoionization of helium at an excess energy of 60 eV using left- and right-elliptically-polarized light, Physical Review A, vol.65, issue.5, p.52717, 2002.
DOI : 10.1103/PhysRevA.65.052717

A. Huetz and J. Mazeau, Double Photoionization of Helium Down to 100 meV above Threshold, Physical Review Letters, vol.85, issue.3, p.530, 2000.
DOI : 10.1103/PhysRevLett.85.530

C. Bouri, P. Selles, L. Malegat, J. M. Teuler, M. G. Njock et al., Dynamics of the helium atom close to the full fragmentation threshold: Ionization excitation, Physical Review A, vol.72, issue.4, p.42716, 2005.
DOI : 10.1103/PhysRevA.72.042716

URL : https://hal.archives-ouvertes.fr/hal-00116662

U. Fano, Excitation of atoms to states of high orbital momentum, Journal of Physics B: Atomic and Molecular Physics, vol.7, issue.14, p.401, 1974.
DOI : 10.1088/0022-3700/7/14/003

J. R. Harries, J. P. Sullivan, S. Obara, P. Hammond, and Y. Azuma, -specific partial photoionization cross-sections using lifetime-resolved fluorescence spectroscopy, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.36, issue.19, p.319, 2003.
DOI : 10.1088/0953-4075/36/19/L03

URL : https://hal.archives-ouvertes.fr/in2p3-01468012

J. R. Harries, J. P. Sullivan, S. Obara, Y. Azuma, J. G. Lambourne et al., ??? doubly-excited states region, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.38, issue.10, p.153, 2005.
DOI : 10.1088/0953-4075/38/10/L04

C. Bouri, P. Selles, L. Malegat, and M. G. Njock, Parabolic versus spherical partial cross sections for photoionization excitation of He near threshold, Physical Review A, vol.74, issue.3, p.32704, 2006.
DOI : 10.1103/PhysRevA.74.032704

URL : https://hal.archives-ouvertes.fr/hal-00263575

U. Fano and J. W. Cooper, Spectral Distribution of Atomic Oscillator Strengths, Reviews of Modern Physics, vol.40, issue.3, p.441, 1968.
DOI : 10.1103/RevModPhys.40.441

M. Y. Amusia, E. G. Drukarev, V. G. Gorshkov, and M. P. Kazachkov, Two-electron photoionization of helium, Journal of Physics B: Atomic and Molecular Physics, vol.8, issue.8, p.1248, 1975.
DOI : 10.1088/0022-3700/8/8/016

C. Bouri, P. Selles, L. Malegat, and M. G. Njock, Dynamics of the helium atom close to the full fragmentation threshold: Double ionization, Physical Review A, vol.73, issue.2, p.22724, 2006.
DOI : 10.1103/PhysRevA.73.022724

URL : https://hal.archives-ouvertes.fr/hal-00263573

H. Kossmann, V. Schmidt, and T. Andersen, Test of Wannier threshold laws: Double-photoionization cross section in helium, Physical Review Letters, vol.60, issue.13, p.1266, 1988.
DOI : 10.1103/PhysRevLett.60.1266

P. L. Bartlett and A. T. Stelbovics, -H Ionizing Collisions, Physical Review Letters, vol.93, issue.23, p.233201, 2004.
DOI : 10.1103/PhysRevLett.93.233201

URL : https://hal.archives-ouvertes.fr/in2p3-00025679

C. Bouri, L. Malegat, P. Selles, and M. G. Njock, Numerical test of the Wannier threshold law for double photoionization of helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.40, issue.4, p.51, 2007.
DOI : 10.1088/0953-4075/40/4/F02

URL : https://hal.archives-ouvertes.fr/hal-00263579

]. H. Bibliographie, E. E. Bethe, and . Salpeter, Quantum Mechanics of One-and Two-Electron Atoms, 1994.

J. A. Samson, Simultaneous Photoexcitation and Photoionization of Helium, Physical Review Letters, vol.22, issue.14, p.693, 1969.
DOI : 10.1103/PhysRevLett.22.693

S. Cvejanovi´ccvejanovi´c, F. H. Read, S. Cvejanovi´ccvejanovi´c, R. C. Shiell, and T. J. Reddish, A new technique for threshold excitation spectroscopy, Journal of Physics B: Atomic and Molecular Physics, vol.7, issue.10, pp.1180-707, 1974.
DOI : 10.1088/0022-3700/7/10/013

P. A. Heimann, U. Becker, H. G. Kerkhoff, B. Langer, D. Szostak et al., Helium and neon photoelectron satellites at threshold, Physical Review A, vol.34, issue.5, p.3782, 1986.
DOI : 10.1103/PhysRevA.34.3782

D. B. Thompson, P. Bolognesi, M. Coreno, R. Camilloni, L. Avaldi et al., A high-resolution study of the threshold photoelectron spectrum of helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.31, issue.10, p.2225, 1998.
DOI : 10.1088/0953-4075/31/10/012

M. O. Krause and F. Wuilleumier, (n=2)+e, Journal of Physics B: Atomic and Molecular Physics, vol.5, issue.7, p.143, 1972.
DOI : 10.1088/0022-3700/5/7/003

S. Svensson, B. Eriksson, N. Mårtensson, G. Wendin, and U. Gelius, Electron shake-up and correlation satellites and continuum shake-off distributions in X-Ray photoelectron spectra of the rare gas atoms, Journal of Electron Spectroscopy and Related Phenomena, vol.47, p.327, 1988.
DOI : 10.1016/0368-2048(88)85020-5

R. Wehlitz, I. A. Sellin, O. Hemmers, S. B. Whitfield, P. Glans et al., Photon energy dependence of ionization-excitation in helium at medium energies, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.30, issue.2, p.51, 1997.
DOI : 10.1088/0953-4075/30/2/004

J. Tang, S. Watanabe, and M. Matsuzawa, General computational method for two-electron systems, Physical Review A, vol.46, issue.5, p.2437, 1992.
DOI : 10.1103/PhysRevA.46.2437

I. Tang and . Shimamura, Double photoionization of helium at low photon energies, Physical Review A, vol.52, issue.5, p.3413, 1995.
DOI : 10.1103/PhysRevA.52.R3413

K. W. Meyer and C. H. Greene, -matrix methods, Physical Review A, vol.50, issue.5, p.3573, 1994.
DOI : 10.1103/PhysRevA.50.R3573

URL : https://hal.archives-ouvertes.fr/hal-00758532

K. W. Meyer, J. L. Bohn, C. H. Greene, and B. D. Esry, Dominance of short-range correlations in photoejection-induced excitation processes, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.30, issue.19, p.641, 1997.
DOI : 10.1088/0953-4075/30/19/003

R. P. Madden and K. Codling, New Autoionizing Atomic Energy Levels in He, Ne, and Ar, Physical Review Letters, vol.10, issue.12, p.516, 1963.
DOI : 10.1103/PhysRevLett.10.516

J. W. Cooper, U. Fano, and F. Prats, Classification of Two-Electron Excitation Levels of Helium, Physical Review Letters, vol.10, issue.12, p.518, 1963.
DOI : 10.1103/PhysRevLett.10.518

O. Sinanoglu and D. R. Herrick, Group theoretic prediction of configuration mixing effects due to Coulomb repulsions in atoms with applications to doubly???excited spectra, The Journal of Chemical Physics, vol.62, issue.3, p.886, 1975.
DOI : 10.1063/1.430540

D. A. Varshalovich, A. N. Moskalev, and V. K. Khersonskii, Quantum Theory of Angular Momentum, World Scientific, 1988.
DOI : 10.1142/0270

R. Püttner, B. Grémaud, D. Delande, M. Domke, M. Martins et al., Statistical Properties of Inter-Series Mixing in Helium: From Integrability to Chaos, Physical Review Letters, vol.86, issue.17, p.3747, 2001.
DOI : 10.1103/PhysRevLett.86.3747

B. Grémaud and D. Delande, Photo-ionization of the helium atom close to the double-ionization threshold: Towards the Ericson regime, Europhysics Letters (EPL), vol.40, issue.4, p.363, 1997.
DOI : 10.1209/epl/i1997-00472-2

H. Kossmann, B. Krässig, and V. Schmidt, resonance in helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.21, issue.9, p.1489, 1988.
DOI : 10.1088/0953-4075/21/9/009

P. Dhez and D. L. Ederer, two-electron excitation in He I, Journal of Physics B: Atomic and Molecular Physics, vol.6, issue.4, p.59, 1973.
DOI : 10.1088/0022-3700/6/4/004

M. A. Hayes and M. P. Scott, Resonances in the simultaneous photoionisation and excitation of He, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.21, issue.9, p.1499, 1988.
DOI : 10.1088/0953-4075/21/9/010

M. Zubek, G. C. King, P. M. Rutter, and F. H. Read, Photoionisation studies of autoionising states of helium between 69 and 77 eV, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.22, issue.21, p.3411, 1989.
DOI : 10.1088/0953-4075/22/21/007

M. Domke, K. Schulz, G. Remmers, G. Kaindl, and D. Wintgen, double-excitation states in helium, Physical Review A, vol.53, issue.3, p.1424, 1996.
DOI : 10.1103/PhysRevA.53.1424

A. Czasch, M. Schöffler, M. Hattas, S. Schössler, T. Jahnke et al., Threshold, Physical Review Letters, vol.95, issue.24, p.243003, 2005.
DOI : 10.1103/PhysRevLett.95.243003

A. Menzel, S. P. Frigo, S. B. Whitfield, C. D. Caldwell, M. O. Krause et al., Decay Paths of Interfering Two-Electron Excitations in Helium, Physical Review Letters, vol.75, issue.8, pp.1479-2080, 1995.
DOI : 10.1103/PhysRevLett.75.1479

E. Baslev and J. M. Combes, Spectral properties of many-body Schr??dinger operators with dilatation-analytic interactions, Communications in Mathematical Physics, vol.12, issue.5, p.280, 1971.
DOI : 10.1007/BF01877511

D. Wintgen and D. Delande, states in helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.26, issue.14, p.399, 1993.
DOI : 10.1088/0953-4075/26/14/004

A. Huetz, P. Lablanquie, L. Andric, P. Selles, and J. Mazeau, Multicoincidence measurements of double photoionization in helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.27, issue.1, p.13, 1994.
DOI : 10.1088/0953-4075/27/1/003

R. Moshammer, J. Ullrich, M. Unverzagt, W. Schmidt, P. Jardin et al., Low-Energy Electrons and Their Dynamical Correlation with Recoil Ions for Single Ionization of Helium by Fast, Heavy-Ion Impact, Physical Review Letters, vol.73, issue.25, p.3371, 1994.
DOI : 10.1103/PhysRevLett.73.3371

A. S. Kheifets and I. Bray, Equal energy-sharing double photoionization of helium from near-threshold to high energies, Physical Review A, vol.62, issue.6, p.65402, 2000.
DOI : 10.1103/PhysRevA.62.065402

J. M. Feagin, Wannier threshold theory for the Coulomb break-up of three-particle systems, Journal of Physics B: Atomic and Molecular Physics, vol.17, issue.12, pp.2433-551, 1984.
DOI : 10.1088/0022-3700/17/12/013

M. Brauner, J. S. Briggs, and H. Klar, Triply-differential cross sections for ionisation of hydrogen atoms by electrons and positrons, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.22, issue.14, p.2265, 1989.
DOI : 10.1088/0953-4075/22/14/010

F. Maulbetsch and J. S. Briggs, Angular distribution of electrons following double photoionization, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.26, issue.11, p.1679, 1993.
DOI : 10.1088/0953-4075/26/11/005

C. W. Mccurdy and T. N. Rescigno, Calculating differential cross sections for electron-impact ionization without explicit use of the asymptotic form, Physical Review A, vol.56, issue.6, p.4369, 1997.
DOI : 10.1103/PhysRevA.56.R4369

M. Baertschy, T. N. Rescigno, W. A. Isaacs, X. Li, C. W. Mccurdy et al., Electron-impact ionization of atomic hydrogen, Physical Review A, vol.63, issue.2, pp.22712-22709, 2001.
DOI : 10.1103/PhysRevA.63.022712

P. L. Bartlett, A. Stelbovics, and I. Bray, Threshold ionization laws for electron-hydrogen scattering and their dominant region of configuration space, Physical Review A, vol.68, issue.3, p.30701, 2003.
DOI : 10.1103/PhysRevA.68.030701

M. S. Pindzola and F. Robicheaux, Time-dependent close-coupling calculations of correlated photoionization processes in helium, Physical Review A, vol.57, issue.1, p.318, 1998.
DOI : 10.1103/PhysRevA.57.318

U. Fano, Effects of Configuration Interaction on Intensities and Phase Shifts, Physical Review, vol.124, issue.6, p.1866, 1961.
DOI : 10.1103/PhysRev.124.1866

P. Selles, L. Malegat, and A. K. Kazansky, calculation of the whole set of He double-photoionization cross sections, Physical Review A, vol.65, issue.3, p.32711, 2002.
DOI : 10.1103/PhysRevA.65.032711

D. Seccombe, S. Collins, T. Reddish, . Selles, A. Malegat et al., with various electron energy sharing conditions, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.35, issue.17, p.3767, 2002.
DOI : 10.1088/0953-4075/35/17/312

S. A. Collins, S. Cvejanovic, C. Dawson, T. J. Reddish, D. P. Seccombe et al., Double photoionization of helium at an excess energy of 60 eV using left- and right-elliptically-polarized light, Physical Review A, vol.65, issue.5, p.52717, 2002.
DOI : 10.1103/PhysRevA.65.052717

P. Selles, L. Malegat, A. Huetz, A. K. Kazansky, and S. A. Collins, matrix with semiclassical outgoing waves, Physical Review A, vol.69, issue.5, p.52707, 2004.
DOI : 10.1103/PhysRevA.69.052707

URL : https://hal.archives-ouvertes.fr/hal-00277349

F. Citrini, Etude Théorique de la Double Photoionisation des Alcalino-Terreux, Thèse de Doctorat, 2002.

F. Citrini, L. Malegat, and P. Selles, Direct double photoionization of the valence shell of Be, Physical Review A, vol.67, issue.4, p.42709, 2003.
DOI : 10.1103/PhysRevA.67.042709

H. Braüning, R. Dörner, C. L. Cocke, M. H. Prior, B. Krässig et al., Absolute triple differential cross sections for photo-double ionization of helium - experiment and theory, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.31, issue.23, p.5149, 1998.
DOI : 10.1088/0953-4075/31/23/012

A. Huetz and J. Mazeau, Double Photoionization of Helium Down to 100 meV above Threshold, Physical Review Letters, vol.85, issue.3, p.530, 2000.
DOI : 10.1103/PhysRevLett.85.530

B. Grémaud and D. Delande, Photo-ionization of the helium atom close to the double-ionization threshold: Towards the Ericson regime, Europhysics Letters (EPL), vol.40, issue.4, p.363, 1997.
DOI : 10.1209/epl/i1997-00472-2

J. Macek, Properties of autoionizing states of He, Journal of Physics B: Atomic and Molecular Physics, vol.1, issue.5, p.831, 1968.
DOI : 10.1088/0022-3700/1/5/309

E. P. Wigner and L. Eisenbud, Higher Angular Momenta and Long Range Interaction in Resonance Reactions, Physical Review, vol.72, issue.1, p.29, 1947.
DOI : 10.1103/PhysRev.72.29

P. G. Burke and W. D. Robb, The R-Matrix Theory of Atomic Processes, Adv. At. Mol. Phys, vol.11, p.143, 1975.
DOI : 10.1016/S0065-2199(08)60030-5

U. Fano, Correlations of two excited electrons, Reports on Progress in Physics, vol.46, issue.2, p.97, 1983.
DOI : 10.1088/0034-4885/46/2/001

J. M. Bizau and F. Wuilleumier, Redetermination of absolute partial photoionization cross sections of He and Ne atoms between 20 and 300 eV photon energy, Journal of Electron Spectroscopy and Related Phenomena, vol.71, issue.3, p.205, 1995.
DOI : 10.1016/0368-2048(94)02268-2

D. A. Varshalovich, A. N. Moskalev, and V. K. Khersonskii, Quantum Theory of Angular Momentum, World Scientific, 1988.
DOI : 10.1142/0270

J. V. Lill, G. A. Parker, and J. C. Light, Discrete variable representations and sudden models in quantum scattering theory, Chemical Physics Letters, vol.89, issue.6, p.483, 1982.
DOI : 10.1016/0009-2614(82)83051-0

J. C. Light, I. P. Hamilton, and J. V. , Generalized discrete variable approximation in quantum mechanics, The Journal of Chemical Physics, vol.82, issue.3, p.1400, 1985.
DOI : 10.1063/1.448462

D. Baye and P. Heenen, Angular momentum projection on a mesh of cranked Hartree-Fock wave functions, Physical Review C, vol.29, issue.3, p.1056, 1984.
DOI : 10.1103/PhysRevC.29.1056

M. Vincke, L. Malegat, and D. Baye, Regularization of singularities in Lagrange-mesh calculations, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.26, issue.5, p.811, 1993.
DOI : 10.1088/0953-4075/26/5/006

J. F. Hart and G. Herzberg, Twenty-Parameter Eigenfunctions and Energy Values of the Ground States of He and He-Like Ions, Physical Review, vol.106, issue.1, p.79, 1957.
DOI : 10.1103/PhysRev.106.79

A. D. Bandrauk and H. Shen, Exponential split operator methods for solving coupled time???dependent Schr??dinger equations, The Journal of Chemical Physics, vol.99, issue.2, p.1185, 1993.
DOI : 10.1063/1.465362

A. Goldberg, H. M. Schey, and J. L. Schwartz, Computer-Generated Motion Pictures of One-Dimensional Quantum-Mechanical Transmission and Reflection Phenomena, American Journal of Physics, vol.35, issue.3, p.177, 1967.
DOI : 10.1119/1.1973991

B. L. Buzbee, G. H. Golub, and C. W. Nielson, On Direct Methods for Solving Poisson???s Equations, SIAM Journal on Numerical Analysis, vol.7, issue.4, p.627, 1970.
DOI : 10.1137/0707049

L. Malegat, P. Selles, and A. Huetz, Double photoionization: I. A new parametrization of the triple differential cross section from first principles, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.30, issue.2, p.251, 1997.
DOI : 10.1088/0953-4075/30/2/018

A. Huetz, P. Selles, D. Waymel, and J. Mazeau, Wannier theory for double photoionization of noble gases, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.24, issue.8, p.1917, 1991.
DOI : 10.1088/0953-4075/24/8/010

C. Bouri, P. Selles, L. Malegat, and M. G. Njock, Dynamics of the helium atom close to the full fragmentation threshold: Double ionization, Physical Review A, vol.73, issue.2, p.22724, 2006.
DOI : 10.1103/PhysRevA.73.022724

URL : https://hal.archives-ouvertes.fr/hal-00263573

A. Huetz and J. Mazeau, Double Photoionization of Helium Down to 100 meV above Threshold, Physical Review Letters, vol.85, issue.3, p.530, 2000.
DOI : 10.1103/PhysRevLett.85.530

J. M. Bizau and F. Wuilleumier, Redetermination of absolute partial photoionization cross sections of He and Ne atoms between 20 and 300 eV photon energy, Journal of Electron Spectroscopy and Related Phenomena, vol.71, issue.3, p.205, 1995.
DOI : 10.1016/0368-2048(94)02268-2

T. Schneider, C. Liu, and J. M. Rost, Intermanifold similarities in partial photoionization cross sections of helium, Physical Review A, vol.65, issue.4, p.42715, 2002.
DOI : 10.1103/PhysRevA.65.042715

H. W. Van-der-hart and C. H. Greene, Regularities and irregularities in partial photoionization cross sections of He, Physical Review A, vol.66, issue.2, p.22710, 2002.
DOI : 10.1103/PhysRevA.66.022710

J. Z. Tang and J. Burgdörfer, Excitation - ionization by photoabsorption at low and intermediate energies, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.30, issue.15, p.523, 1997.
DOI : 10.1088/0953-4075/30/15/003

K. W. Meyer, J. L. Bohn, C. H. Greene, and B. D. Esry, Dominance of short-range correlations in photoejection-induced excitation processes, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.30, issue.19, p.641, 1997.
DOI : 10.1088/0953-4075/30/19/003

A. Kheifets and I. Bray, Effect of the ground-state correlations on the helium double photoionization and ionization with excitation, Physical Review A, vol.57, issue.4, p.2590, 1998.
DOI : 10.1103/PhysRevA.57.2590

P. A. Heimann, U. Becker, H. G. Kerkhoff, B. Langer, D. Szostak et al., Helium and neon photoelectron satellites at threshold, Physical Review A, vol.34, issue.5, p.3782, 1986.
DOI : 10.1103/PhysRevA.34.3782

D. W. Lindle, P. A. Heimann, T. A. Ferrett, and D. A. Shirley, lines, Physical Review A, vol.35, issue.3, p.1128, 1987.
DOI : 10.1103/PhysRevA.35.1128

R. I. Hall, L. Avaldi, G. Dawber, M. Zubek, K. Ellis et al., Photoionization phenomena near the double-ionization threshold of helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.24, issue.1, p.115, 1991.
DOI : 10.1088/0953-4075/24/1/014

U. Fano, Excitation of atoms to states of high orbital momentum, Journal of Physics B: Atomic and Molecular Physics, vol.7, issue.14, p.401, 1974.
DOI : 10.1088/0022-3700/7/14/003

A. R. Rau, Direct excitation of states of high l by electron impact, Journal of Physics B: Atomic and Molecular Physics, vol.17, issue.3, p.75, 1984.
DOI : 10.1088/0022-3700/17/3/004

P. Hammond, F. H. Read, and G. C. King, Excitation of atomic states of high angular momentum by near-threshold electron impact, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.21, issue.18, p.3123, 1988.
DOI : 10.1088/0953-4075/21/18/013

J. R. Harries, J. P. Sullivan, S. Obara, P. Hammond, and Y. Azuma, -specific partial photoionization cross-sections using lifetime-resolved fluorescence spectroscopy, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.36, issue.19, p.319, 2003.
DOI : 10.1088/0953-4075/36/19/L03

URL : https://hal.archives-ouvertes.fr/in2p3-01468012

J. R. Harries, J. P. Sullivan, S. Obara, Y. Azuma, J. G. Lambourne et al., ??? doubly-excited states region, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.38, issue.10, p.153, 2005.
DOI : 10.1088/0953-4075/38/10/L04

H. A. Bethe and E. E. Salpeter, Quantum Mechanics of One-and Two-Electron Atoms, 1957.

J. M. Feagin and J. S. Briggs, Molecular-orbital description of the states of two-electron systems, Physical Review A, vol.37, issue.12, p.4599, 1988.
DOI : 10.1103/PhysRevA.37.4599

C. D. Lin, Classification of Doubly Excited States of Two-Electron Atoms, Physical Review Letters, vol.51, issue.15, pp.1348-1019, 1983.
DOI : 10.1103/PhysRevLett.51.1348

M. J. Englefield, Group Theory and the Coulomb Problem, 1972.

D. A. Varshalovich, A. N. Moskalev, and V. K. Khersonskii, Quantum Theory of Angular Momentum, World Scientific, 1988.
DOI : 10.1142/0270

C. H. Greene, Manifestation of Dynamically Unfavored Transitions in the Angular Distribution of Photogragments, Physical Review Letters, vol.44, issue.13, p.869, 1980.
DOI : 10.1103/PhysRevLett.44.869

A. Huetz, P. Selles, D. Waymel, and J. Mazeau, Wannier theory for double photoionization of noble gases, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.24, issue.8, p.1917, 1991.
DOI : 10.1088/0953-4075/24/8/010

P. A. Heimann, U. Becker, H. G. Kerkhoff, B. Langer, D. Szostak et al., Helium and neon photoelectron satellites at threshold, Physical Review A, vol.34, issue.5, p.3782, 1986.
DOI : 10.1103/PhysRevA.34.3782

R. P. Madden and K. Codling, New Autoionizing Atomic Energy Levels in He, Ne, and Ar, Physical Review Letters, vol.10, issue.12, p.516, 1963.
DOI : 10.1103/PhysRevLett.10.516

M. Domke, K. Schulz, G. Remmers, G. Kaindl, and D. Wintgen, double-excitation states in helium, Physical Review A, vol.53, issue.3, p.1424, 1996.
DOI : 10.1103/PhysRevA.53.1424

U. Fano and J. W. Cooper, Spectral Distribution of Atomic Oscillator Strengths, Reviews of Modern Physics, vol.40, issue.3, p.441, 1968.
DOI : 10.1103/RevModPhys.40.441

M. Y. Amusia, E. G. Drukarev, V. G. Gorshkov, and M. P. Kazachkov, Two-electron photoionization of helium, Journal of Physics B: Atomic and Molecular Physics, vol.8, issue.8, p.1248, 1975.
DOI : 10.1088/0022-3700/8/8/016

T. Suri´csuri´c, E. G. Drukarev, and R. H. Pratt, Characterization of high-energy photoionization in terms of the singularities of the atomic potential. I. Photoionization of the ground state of a two-electron atom, Physical Review A, vol.67, issue.2, p.22709, 2003.
DOI : 10.1103/PhysRevA.67.022709

F. H. Read and S. Cvejanovi´ccvejanovi´c, Energy partitioning in near-threshold excitation and ionisation of atoms by photon or electron impact, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.21, issue.13, p.371, 1988.
DOI : 10.1088/0953-4075/21/13/002

G. C. King, M. Zubek, P. M. Rutter, F. H. Read, A. A. Macdowell et al., A study of threshold photoionisation and double photoionisation in helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.21, issue.14, p.403, 1988.
DOI : 10.1088/0953-4075/21/14/003

C. H. Greene, Manifestation of Dynamically Unfavored Transitions in the Angular Distribution of Photogragments, Physical Review Letters, vol.44, issue.13, p.869, 1980.
DOI : 10.1103/PhysRevLett.44.869

R. Wehlitz, F. Heiser, O. Hemmers, B. Langer, A. Menzel et al., Electron-energy and -angular distributions in the double photoionization of helium, Physical Review Letters, vol.67, issue.27, p.3764, 1991.
DOI : 10.1103/PhysRevLett.67.3764

D. Proulx and R. Shakeshaft, Double ionization of helium by a single photon with energy 89???140 eV, Physical Review A, vol.48, issue.2, p.875, 1993.
DOI : 10.1103/PhysRevA.48.R875

M. Pont and R. Shakeshaft, Absolute cross sections for double photoionization of helium at energies from 0 to 80 eV above threshold, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.28, issue.18, p.571, 1995.
DOI : 10.1088/0953-4075/28/18/001

G. Dawber, R. I. Hall, A. G. Mcconkey, M. A. Macdonald, and G. C. King, Asymmetry parameters for near-threshold photo-double ionization of helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.27, issue.14, p.341, 1994.
DOI : 10.1088/0953-4075/27/14/007

A. Huetz and J. Mazeau, Double Photoionization of Helium Down to 100 meV above Threshold, Physical Review Letters, vol.85, issue.3, p.530, 2000.
DOI : 10.1103/PhysRevLett.85.530

A. Huetz, P. Selles, D. Waymel, and J. Mazeau, Wannier theory for double photoionization of noble gases, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.24, issue.8, p.1917, 1991.
DOI : 10.1088/0953-4075/24/8/010

C. H. Greene, Angular distribution of slow photoelectrons near the threshold for double escape, Journal of Physics B: Atomic and Molecular Physics, vol.20, issue.12, p.357, 1987.
DOI : 10.1088/0022-3700/20/12/003

C. 6. La, . De, . De, and . Pour-l-', IONISATION DOUBLE Conclusion Nous avons présenté les sections efficaces intégrées de double ionisation calculées dans la région du seuil pour des excès d'´ energie variant de 0.1 ` a 7 eV. Par une technique de fit aux moindres carrés, nous avons montré que ces sections efficaces suivent bien la loi de seuil de Wannier. Nous avons obtenu des estimations, non seulement de l

]. T. Roth, Final States, Physical Review A, vol.5, issue.1, p.476, 1972.
DOI : 10.1103/PhysRevA.5.476

URL : https://hal.archives-ouvertes.fr/in2p3-00001182

G. H. Wannier, Threshold Law for Multiple Ionization, Physical Review, vol.100, issue.4, p.1180, 1955.
DOI : 10.1103/PhysRev.100.1180

M. Y. Kuchiev and V. N. Ostrovsky, Threshold laws for the breakup of atomic particles into several charged fragments, Physical Review A, vol.58, issue.1, p.321, 1998.
DOI : 10.1103/PhysRevA.58.321

F. H. Read and S. Cvejanoviç, Energy partitioning in near-threshold excitation and ionisation of atoms by photon or electron impact, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.21, issue.13, p.371, 1988.
DOI : 10.1088/0953-4075/21/13/002

G. C. King, M. Zubek, P. M. Rutter, F. H. Read, A. A. Macdowell et al., A study of threshold photoionisation and double photoionisation in helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.21, issue.14, p.403, 1988.
DOI : 10.1088/0953-4075/21/14/003

R. I. Hall, L. Avaldi, G. Dawber, M. Zubek, K. Ellis et al., Photoionization phenomena near the double-ionization threshold of helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.24, issue.1, p.115, 1991.
DOI : 10.1088/0953-4075/24/1/014

R. I. Hall, A. G. Mcgonkey, L. Avaldi, K. Ellis, M. A. Macdonald et al., Threshold photo-double ionization processes in helium studied by a photoelectron/photoion coincidence technique, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.25, issue.6, p.1195, 1992.
DOI : 10.1088/0953-4075/25/6/011

S. Cvejanovi´ccvejanovi´c, R. Shiell, and T. J. Reddish, The double ionization cusp in the threshold photoelectron spectrum of helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.28, issue.23, p.707, 1995.
DOI : 10.1088/0953-4075/28/23/002

D. B. Thompson, P. Bolognesi, M. Coreno, R. Camilloni, L. Avaldi et al., A high-resolution study of the threshold photoelectron spectrum of helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.31, issue.10, p.2225, 1998.
DOI : 10.1088/0953-4075/31/10/012

R. Wehlitz, The Wannier threshold law examined by photoelectron satellite measurements, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.32, issue.22, p.635, 1999.
DOI : 10.1088/0953-4075/32/22/101

J. B. Donahue, Ion near Threshold, Physical Review Letters, vol.48, issue.22, p.1538, 1982.
DOI : 10.1103/PhysRevLett.48.1538

Y. K. Bae and J. R. Peterson, two-electron photoionization cross sections, Physical Review A, vol.37, issue.9, p.3254, 1988.
DOI : 10.1103/PhysRevA.37.3254

P. Lablanquie, K. Ito, P. Morin, I. Nenner, and J. H. Eland, One photon double ionization of helium: threshold behaviour, Zeitschrift f??r Physik D: Atoms, Molecules and Clusters, vol.11, issue.2, p.77, 1990.
DOI : 10.1007/BF01679566

H. Kossmann, V. Schmidt, and T. Andersen, Test of Wannier threshold laws: Double-photoionization cross section in helium, Physical Review Letters, vol.60, issue.13, p.1266, 1988.
DOI : 10.1103/PhysRevLett.60.1266

P. L. Bartlett and A. T. Stelbovics, -H Ionizing Collisions, Physical Review Letters, vol.93, issue.23, p.233201, 2004.
DOI : 10.1103/PhysRevLett.93.233201

URL : https://hal.archives-ouvertes.fr/in2p3-00025679

C. Bouri, P. Selles, L. Malegat, and M. Kwato-njock, Dynamics of the helium atom close to the full fragmentation threshold: Double ionization, Physical Review A, vol.73, issue.2, p.22724, 2006.
DOI : 10.1103/PhysRevA.73.022724

URL : https://hal.archives-ouvertes.fr/hal-00263573

P. Selles, L. Malegat, A. Huetz, A. K. Kazansky, S. A. Collins et al., matrix with semiclassical outgoing waves, Physical Review A, vol.69, issue.5, p.52707, 2004.
DOI : 10.1103/PhysRevA.69.052707

URL : https://hal.archives-ouvertes.fr/hal-00277349

J. M. Bizau and F. Wuilleumier, Redetermination of absolute partial photoionization cross sections of He and Ne atoms between 20 and 300 eV photon energy, Journal of Electron Spectroscopy and Related Phenomena, vol.71, issue.3, p.205, 1995.
DOI : 10.1016/0368-2048(94)02268-2

P. R. Bevington, Data Reduction and Error Analysis for the Physical Sciences, Computers in Physics, vol.7, issue.4, 1969.
DOI : 10.1063/1.4823194

W. H. Press, S. A. Teukolsky, W. T. Vetterling, and B. P. Flannery, Numerical Recipes in Fortran The Art of Scientific Computing, 1994.

P. L. Bartlett and A. T. Stelbovics, Complete direct method for electron-hydrogen scattering: Application to the collinear and Temkin-Poet models, Physical Review A, vol.69, issue.2, p.22703, 2004.
DOI : 10.1103/PhysRevA.69.022703

U. Fano, Effects of Configuration Interaction on Intensities and Phase Shifts, Physical Review, vol.124, issue.6, p.1866, 1961.
DOI : 10.1103/PhysRev.124.1866

U. Fano and J. W. Cooper, Line Profiles in the Far-uv Absorption Spectra of the Rare Gases, Physical Review, vol.137, issue.5A, p.1364, 1965.
DOI : 10.1103/PhysRev.137.A1364

A. Menzel, S. P. Frigo, S. B. Whitfield, C. D. Caldwell, and M. O. Krause, =5 threshold in helium, Physical Review A, vol.54, issue.3, p.2080, 1996.
DOI : 10.1103/PhysRevA.54.2080

A. Menzel, S. P. Frigo, S. B. Whitfield, C. D. Caldwell, M. O. Krause et al., Decay Paths of Interfering Two-Electron Excitations in Helium, Physical Review Letters, vol.75, issue.8, p.1479, 1995.
DOI : 10.1103/PhysRevLett.75.1479

A. F. Starace, Behavior of partial cross sections and branching ratios in the neighborhood of a resonance, Physical Review A, vol.16, issue.1, pp.231-1731, 1977.
DOI : 10.1103/PhysRevA.16.231

M. Domke, K. Schulz, G. Remmers, G. Kaindl, and D. Wintgen, double-excitation states in helium, Physical Review A, vol.53, issue.3, p.1424, 1996.
DOI : 10.1103/PhysRevA.53.1424

J. M. Rost, K. Schulz, M. Domke, and G. Kaindl, Resonance parameters of photo doubly excited helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.30, issue.21, p.4663, 1997.
DOI : 10.1088/0953-4075/30/21/010

Y. H. Jiang, R. Püttner, and G. Kaindl, Theoretical photoionization partial cross sections and angular distribution parameters of doubly excited helium, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.38, issue.13, p.2157, 2005.
DOI : 10.1088/0953-4075/38/13/009

M. A. Hayes and M. P. Scott, Resonances in the simultaneous photoionisation and excitation of He, Journal of Physics B: Atomic, Molecular and Optical Physics, vol.21, issue.9, p.1499, 1988.
DOI : 10.1088/0953-4075/21/9/010

J. M. Bizau and F. Wuilleumier, Redetermination of absolute partial photoionization cross sections of He and Ne atoms between 20 and 300 eV photon energy, Journal of Electron Spectroscopy and Related Phenomena, vol.71, issue.3, p.205, 1995.
DOI : 10.1016/0368-2048(94)02268-2